Method of and apparatus for burning pulverized fuel



May 14, 1929.

H. KREISINGER ET AL 1,712,999

METHOQ OF' AND APPARATUS FOR BURNING PULVERIZED FUEL" FledApril 26. 1922 3 Sheets-Sheei l WITNEJ.

METHOD OF AND APPARATUS FOR BURNING PULVRIZED FUEL led April 2, 1922 3 Sheets-Sheet 2 lll dlll

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alhis invention relutes to u method of und uppurutus for burning pulveriued fuel und one of the primury objects of our invention is to .promote more perfect und rupid eombustion und to increuse efficiency.. ,llinother object is to burn more fuel in less time in u furnuce of given sire; or to increase the cupueity of un emsting furnace of given size. "llhe foregoing, together vvith such other objects us muy hereinafter uppeurD or ure incident to our invention, vve obtuin by menus of u method und uppurutus, illustrsted in preferred form in the uccoinpunying drewings in connection vvith4 u steum generuting boiler, for which purpose our invention is purticulurly useful..

. Uf the druvvin "s, ldg. l is n longitudinul verticul section through u furnece embodying vour improvements; lig. El is u section teilten on the line Qt-2 of Fig. l; Figs. 3 und l ure enlurged sectional views of the burner.

meehunism used in carrying out our invention9 llfig. l being e section tulren on the line 'lt-l of lllig. 3; fig., 5 illustrutes u modifiestion of our invention purtlyin section und purtly in lung und Fig. d is u purtiully sectionul un plun vievv illustruting still .zur other modifieution of our invention.

Referring novv purticulerly to higslfl and Ela it vvill he seen thnt the combustion chember d. of the furnuce is substuntiully rectanguler in cross section, und hns considerable horiuontul length und verticul depth. The horizontnl depth is less then the lengthl und muy be less then the verticul depth. llt the top, the combustion chamber is provided with un outlet ly over which ure locuted the evuporuting surfuces of the boiler, such, for euumple9 es the benls of tubes tl. lhe conibustion chumber is of such siz'e thut coinbustion is completed therein in the niunner dit ,ijf/"hereinufter deseribed, und thev het guses ere bundled through the tubes il in uny desired munner und linully conducted'to the' due 9 lending to the stuck, `(not shovvn) creating the druft.

ln the top vvull l0 ofthe combustion chum-- loer vve urrunge u rovv of burners B,`the eonstruction of vvhich vvill be hereinufter more fully described. 'lhese burners deliver the fuel in tt dovvnvvurd direction, udyuce'nt the front ttul-l ll through vvhich' preferubly u lurge ltetlletl lilo. 556,566?.

portion-of the ui'r needed for combustion is supplied through ineens of the rovrs of openings l2. 'lhere ure s plurality of openings in euch rovv, und the openings of one rovv sirel pl'eferubly stuggered with respect to the openings of the udjucent rovv or rows; all of the' openings constituting n buttery through 1 erubly miiredvvvith sucient :tir to ect es currying nir, und the miuture is preferably delivered et u velocity such thut the druft vvill turn the fuel sind flume stresin above the bottom ofthe combustion chamber.

llteferring now to'llfigs. l9 3 und l, the fuel, or u, minture of the fuel und uir is delivered to euch burner by ineens of u pipe lll, such pipe dischurging into e burner nozzle l5. rlhis member muy he termed et fish-teil burner nozzle becnuse of its shupe., llt is designed to deliver'the fuel, or u mixture thereof with uir, into the combustion chamber in the form of nthin sheet lb?.l 'fllhe Vdischutrging sheet Aof fuel is surrounded by uit' which is drawn through the burner @using ll by induction. The nmount of 'nir thus rnvvn through the burner cusing directly sround the sheet is controlled by the dempers lll, -vvhich may be varied es cenditions demand., 'lhe interior of the cri-sing ll is divided hy u vvall or sep# tum i9 providingu, channel 2O on the inside of the burner, thut is the side toward the out let l .lll body of nir is ulso druvvn through this chunnel AQOQthe momentum of this body of nir being cupuble of vuristion, through proper munipulutionnnd udjustnient4 of the' 'dempers l@ und the Inuin demper 2l. The' ehunnel 2U supplies the spuce between. the

descending und uscending portions of 'the'fuel end ume lstreum, thereby supplying oxygen for combustion ut such-point most effectively. "lhis is of iinportunce for the individuel entering'ttrenms lutter unite in u single streum as gasification and expansion take hplacer In this connection the ascending portions may "be considered as. a single body or stream.

Of the air which is drawn through the battery of openings 12 in the front wall l1., a portion findsits way to the spaces between the sheets as they leave the burners and from thence into the space between downward and.

ascending .portions of the fuel and flame streams; a portion is mixed with the `fuel and flame as gasification begins with cnsequent expansion and setting up of-eddies'; and a portion follows the natural streamline course of the fuel and flame stream, bordering'such stream and providing a body of air into vwhich the heavier unconsumed or partially that the greatest opportunity is presented for the envelopmg ofveach particle of fuel withy a body of air, notwithstanding which the aggregate amount. of fuelwhich may be admitted maybe considerably increased over the amount Vpossible-in other practices. The auxiliary air is successively supplied through the inlets 12 to meet requirements as combustion proceedsl and the. air induced travels at lless velocity than the incoming fuel setting up eddying. In consequence of the foregoing, ignition takes place more quickly and combustion is completed more rapidly.

' Incombustibles or refise matter not carried out through the stack, gravitate to the bottom in the form of a ilocculent ash, the

.deposit-being cooled by the water screen located in the bot-tom portion of the combustion chamber and consisting of pipes 22 and 23 connected into the circulation of the boiler; Any desired numberof such pipes may be employed. Their function is to absorb the radiant heat from the de osit and maintain the temperature thereof yelovv the point at Which coalescing or substantial fusion takes place. TheA ash Amay, therefore, be. readily removed threglfthe' ash door 24. and continuous operation' of the furnace had Without shutting down for the removal .of slag.V

The walls of' thecombustion Achamber are cut vback as indicated at 2 5- toprovide re entrant portions. The slag which forms on..

the vertical-Walls in dripping down from the overhanging portions 'cooled by the screen andthe drippingsy remain in the form of' more or less small nodules, readily capable of removal with theI ash. j

"and there are fewer burners to a row than would be the case Where firing but from one v side of the furnace is employed, as in the construction of Figs. 1 and 2. By this arrangement opportunity is provided for the sheets to, as it were, interlace as theyex and and are turned in toward each other. hus with two sided burning proper air supply may be had with a minimum horizontal depth of combustion chamber.

In the modification shown in Fig. 6, a two sided burning arrangement is shown, but in this case the burners of one row areopposite, or more properly speaking, in alignlment with the burners ofthe opposite row.

With such arrangement the combustion should have 4.greater lhorizontal depth as indicated.

It will be seen that in each form we obtain the advantageA of beinff able to admit a maximum quantity. of fue? in such manner as to secure maximum exposure to enveloping air, 05 with quicker ignition and more rapid combustion, and this in a combustion chamber of minimum size. Y h

What We claim is:

1. In pulverized fuel burning apparatus,

lthe combination of a furnacehaving an outlet, vand a roW.of-burners on each of two opposite sides thereof, said burners being constructed to each deliver fuel in `the form of a sheet, the slieets of each roW- resenting their sidestoward each other, and t 1e sheets of each row being adjacent one another.

2. In pulverized fuel burning apparatus, the combination'of a furnace having an out-- let, and a row of burners on each of two op- 11o posite sides thereof, said burners being constructed to cach deliver fuel in the form of a Sheet, the sheets of each. row presenting their sides toward each other',=and the sheets of one row being staggered `With respect to those of the other row.

3. In apparatus for burning pulverized fuel, the combination, with; a combustion chamber having walls and an oftake for the products of combustion located in an upper part of the chamber, of a row of burners at the top of the'chamber adjacent a Wall removed from the oitake and directed down- Wardly, each burner having a pulvcrized fuel nozzle of elongated cross-section the longer dimensionof which is in a plane substantially perpendicular to the plane of said wall, .so that each stream of fuel in suspension'bends on edge to take a Ushaped course to the oiitake, and air admission means in said Wall dcl liver-mg air transversely of the How of the legs of the U in a direction parallel Witht-he planes of the sheets of fuel.

4. The method of burning pulverized fuel 5 in Ia chamber having an olftake in an upper part, which consists inadmitting the fuel downwardly from an upper portion oftlle chamber remote from the ol'take in a plurality of substantially parallel sheet-like streams lo presenting their flat sides toward one another, in bending each fuel and flame stream on its edge toward the otalie to take a U- shaped course through the chamber, in admitting air for combustion transversely of the legs of the U in a direction parallel with the planes of the sheets of fuel, in igniting the fuel, andin burning it in suspension Within the ehan'ioer.

In testimony whereof, We have hereunto signed our names.

HENRY KREISINGER. JOHN ANDERSON. 

